Amiga CD32 drive unit adjustment & circuit analysis

The purpose of this video is primarily to give other people an idea of how I adjusted this Amiga CD32 drive unit to have it read CD-R discs really well, which it wouldn’t do before the adjustment.
However, a good understanding of how the drive unit works is essential in order to be able to make the adjustment correctly. Therefore, this is a very in-depth video that covers not only the adjustment procedure itself, but also all the theory that goes behind it.
The following is included in the video:

A lot of the information presented in this video can be applied to any kind of CD player and CD-ROM unit, since the topology behind them is usually the same, only with some minor differences between brands and models. It’s also very likely that most of the information being presented here can be applied to different types of DVD-based systems as well.

*NOTE:
I am doing an adjustment of FEG starting from 03:37:53 in the video.
However, at this time in the video, I forgot to set the scope back to the right timebase, and I’m also using a CD-R for this adjustment although using an original audio disc is better. So this part should really not be included in the video since it’s not a good adjustment technique. However, I realized this after already having uploaded the video to YouTube, and there is no way I’m going to edit, render and then upload the whole video again.
A correct way of adjusting FEG is still included in the video, which can be found starting from 02:44:14.
So as for the FEG adjustment, please disregard from what is shown in the video between 03:36:47 and 03:42:55.
After shooting this video, I double-checked the adjustment using other scope settings.

Feel free to ask questions and leave any possible corrections in the comments section below.

Some “fun” facts:
After editing, it took over 44 hours for my computer to render this whole video in 1080p. Yes, I timed it.
Also, during the first two rendering attempts, my buggy video editor froze halfway through which forced me to initiate rendering several times over. So, I expect the total rendering time for this video to be close to 100 hours. Crazy, isn’t it?
Luckily enough, I at least had the chance to use my friend’s 100 Mbit internet connection to upload the video to YouTube. The whole 18.3 GB file was uploaded in an incredible 40 minutes! It would probably have been a nightmare to upload it at 3 Mbit/s (in reality 2.2 Mbit/s) using my own ISP.
I think I will try to keep my videos a bit shorter in the future… 🙂